Which of the following statements is true regarding convection ovens?

The statement regarding convection ovens that is true is that they use fans to circulate hot air for even cooking. Convection ovens are designed to enhance the cooking process through a fan that distributes hot air throughout the oven's interior. This circulation helps to maintain a consistent cooking temperature and allows food to cook more evenly and efficiently than in a conventional oven, which relies solely on radiant heat. This method not only speeds up cooking times but also contributes to better browning and crisping of food.

The other options do not accurately describe the function and capabilities of convection ovens. They do not use direct flames, which means the cooking process is safer and more controlled, and while they can bake, they are versatile enough to handle a variety of cooking methods, not just limited to baking. Additionally, convection ovens are not specifically designed for frying, as this typically requires a different type of equipment, such as a deep fryer.